Centering-mold.



PATENTED MAY 21, 190?.

J. B. BLAW. CENTEBING MOLD.

APPLICATION FILED N0v.12. 1-906.

3 SHEETSSHEET 1,

INVENTQR PATENTED MAY 21, 1907 J. B. BLAW.

GENTERING MOLD.

APPLICATION FILED NOV. 12. 1-906.

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ygizwa/ No. 858,953. PATENTED MAY 21, 1907.

. J. B. BLAW.

GBNTERING MOLD.

APPLIGATION TILED NOV. 12, 1906.

3 SHEETSSHEET 3.

wwrtasses I I v wlzzgzlw V 4 and similar passa of mold, and

' action. The mold' is shown in stirrup snares rans sauce.

JACOB B. BLAW, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO BLAW SYLVANIA, A CORPORATION OF NEW JERSEY.

cenveamemom,

, Specification of Letters Patent.

Patented May21, 1907.

Applicatlonfled-November12,1906. Serial No. 348.006.

To all whom it may concern:

.Be it known that I, JACOB B..BLAW, a citizen of the United States,'residi ng at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in, Centering- Iviolds, of; which the following ,is a specification. I My invention relates to collapsible molds iorconstructing concrete sewers, conduits, es ;and has for aits'objects; to provide a mol of flexible material which may be easily collapsed and handled; to provide a mold having'superiorbracing and collapsing means; and to provide a mold of the above type having improved means whereby it may be moved from one portion of the sewer 'to another. These and other objectsare accomplished by my invention one embodiment, oi'which is illustrated in the accompanying drawings in which, u Figure'l is an end view of the mold, Figure 2"is an end view of a modified form Figure 3 is an end modification. i

My device is preferably constructed of thin sheet metal which can be easily handled and which can be detached from the concrete after it has set by a gradual or peeling primarily intended for large size conduits or sewers, in which each member is' composed of a plurality of sections for ease in handling, and a thorough system of bracing is necessitated because of the size and flexibility of the plates, but it is obvious that certain of the general features of construction are applicable to molds for forming any size of passage. v

Referrin first to the form] of device as igure 1, it will be seen thatthe mold is composed of four sections or plates numbered 1, 2, 3, and 4, which plates are of thin sheet metal secured together and constitute a half of a tube. The sections 2 and Bare connected detachably to the members 1 and 4 respectively by means of the angle view of still another irons 5 which angle irons are riveted tothe members 2 and 3 andare provided with slots through which the loop members 6 secured to the members 1 and 4, pass and are held in place by means of small wedges (not shown), Thetwo members2 and 3 are detachably secured together by means of the angle irons? which members are secured to the plates 2 and 3 and secured to each other detachably by means of cross bolts. 'The sections a braced by means of the turn buckles 7,8, 9, 10, 11, and 12, which turn buckles are necessary for bracing because of the flexibility of the thin metal and are also of use in collapsing the mold after the concrete has set about it. The upper ends of the turn buckles 8 and 12 fit removably into the projecting flanges of the'angles 5, which an' gles similarly received a slight distance further along the ends of tlie turnbuckle 10. l

The upper ends of the turn buckles 9 and 11 are carried by the angles 13 riveted to the members 2 and 3.

Adjacent the lower edges of the plates 1 and 4 are secured the angles 14 wvhich angles are provided with holes for receiving the ends of the turn buckles 7, 8, 9, 11, and. 12, it being understood that the various holes for the turn buckles are s aced along the angles 14 so that there will )e no interference. Other angle sections 15 and 16 are riveted. to the plates 1 and 4 and constitute'a means for supporting the Wheels 16, such wheels being mounted upon brackets 17 secured to the angles 15 and 16 and additionally secured by means of upwardly extending struts 18 also secured at their upper ends to the angles 15 The lower edges of the mernbers 1 and 4 are provided with the inwardly projecting angle irons 19 for resting upon the timbers 20 when the mold is in operative position. The timbers 20 extend along the floor of the sewer which is indicated by the line 21, which floor is laid at the desired level preliminary to the formation of the rest of the mold. The timbers 20 are securely held in position by a transversely extending frame work consisting of the braces 22 also shown in dotted lines. At the sides of the timbers 20 other smaller timbers 23 are secured,

which members 23 constitute a track on which the wheels 16 run when the mold is collapsed and the walls sprung in so that such wheels 16 are permitted to drop down. The mold is collapsed by tightening the various turn buckles and thereby releasingthe grip of theplates upon the concrete to such an exdown into positent that the mold will dro tion for movement along t 1e track member 23. The mold can then be moved along its into position f or-forming another length of sewer. It will be understood that the length of the plates constituting the sections nal direction will depend upon the length of such section. It will be apparent that the system of bracing shown secures a rigid struc 'ture and gives a maximum strength for the material used as each brace extends in sub- I st'antially a radial direction andtends to resist the'deforming strain in the most effective manner. It will also be apparent that the arrangement of braces secures an effectual collapsing when they are contracted in length. Furthermore by securing the braces 8 and 12 to the angles 5, a stiffening of the mold m'einber at the joint is secured, which stiffening is of course, desirable at this place which would otherwisebe easily deformed. The wheels 16 provide for the easy transfer of the mold without. taking the sections apart and are secured to the mold in such a way that no unnecessary strain is thrown upon the thin members 1, and 2.

In Figure 2 a modified structure is shown which structure differs in that the number of radial braces 24 corresponding to the braces 8, 9, 11, 12, of Figure 1 is increased and the I upper ends of such braces are secured in every case to angle joints corresponding to the joint 7, 7 at the top, of the mold in Figure 1.

- The construction also differs from that of Figure 1 in that there are no braces extend: ing horizontally across the mold and corresponding to the braces 7 and 10. ferences are due to the difference in shape-of the sewer to be produced and each is obvifously better adapted to its form'of section Figure and the changes involved are those I natural y incident to the reduction in size.

Only t 0 members 26 are used to form the mold a d the number of braces is reduced to four as indicated in the drawing. Further- These difmore the brackets carrying the wheels 27 are attached directly to the side members 26 and the stiffening angles 15 of Figure 1 are done away with. Inoperation the device is substantially the same as that of Figure 1.

Having thus described my invention and illustrated its use, what I claim a new and desire to secure by Letters Patt it, is the following:

1. In combination, a parti-tubular mold member of flexible material and radially directed stiffening and collapsing braces exten ding from the edges of the member to the oppositesides of the mold.

2. In combination, a )arti-tubnlar mold member of flexible material, and a plurality of radially directed stiffening and collapsing braces extending from each of the edges of the member to different points on the opposite walls of' the mold.

3. In combination, a parti-tubular mold member of flexible material provided with stiffening sections along its lower edges and radially direct-ed stiffening and collapsing braces extending from the edges of the member to the opposite sides of the mold.

4. In combination, a parti-tnbnlar mold member of flexible material compri ing a plurality of sections removn bl y secured together at "the edges by flanged'sliffenihg sections and radially directed stiffening and collapsing braces ex tending from the edges of the member to the flanges of the stiffening section's.

5. In combination, a parti-tubular mold member of flexible material, transversely extending stiffening and collapsing braces secured to the edges of the member, and wheels niounted adjacent such edges.

6. In combination, a parti-tubular 1nol member of flexible material, stiffening sections extending up from.the edges of the member, transversely extending stiffening and colla sing braces secured adjacent the edges of t e member, and wheels secured to the stiffening sections.

In testimony whereof, I hereunto sign my name in the presence of the two subscribed witnesses.

JACOB B. BLAW.

Witnesses: i J. C. BRADLEY, ARCIIWORTII MARTIN, 

